Disturbed expression of phase I and phase II estrogen-metabolizing enzymes in endometrial cancer: lower levels of CYP1B1 and increased expression of S-COMT
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Expression levels of genes encoding phase I and phase II estrogen-metabolizing enzymes: CYP1A1, CYP1A2, CYP1B1, CYP3A5, CYP3A7, SULT1A1, SULT1E1, SULT2B1, COMT, UGT2B7, and GSTP1 were studied by real-time PCR in 38 samples of cancerous and adjacent control endometrium. We found significantly lower levels of CYP1B1 and CYP3A7, higher levels of SULT2B1, UGT2B7 and GSTP1, and no differences in expression of COMT, CYP1A1, CYP3A5, SULT1E1 and SULT2A1 in the endometrial cancers. The CYP1B1 and COMT proteins were also examined by Western blotting and immunohistochemical staining, supporting the real-time PCR analysis. Lower levels of CYP1B1 detected in cancerous endometrium suggest its important role in control, precancerous tissue. Additionally, we showed for the first time higher protein levels of soluble COMT in cancerous endometrium, and higher levels of membrane-bound COMT in control, precancerous endometrium. The importance of the changed ratio between soluble and membrane-bound COMT still needs to be evaluated in further studies.
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Conjugation with a charged group limits transport over membranes to active transport, thereby allowing concentration of the metabolite on one side.
“Additionally, conjugation with a charged group limits transport over membranes to active transport, thereby allowing for the concentration of the metabolite on one side [87,88].”
From Human steroid biosynthesis, metabolism and excretion are differentially reflected by serum and urine steroid metabolomes: a comprehensive review (2019) · cites this paper as [88]
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Self-citation
- Authors
- Hevir, N., Šinkovec, J., & Rižner, T. L.
- Affiliations
- University of Ljubljana (SI)
- Ljubljana University Medical Centre (SI)
- Corresponding author
- Rižner, Tea Lanišnik
- ORCID
- Rižner, Tea Lanišnik
- Venue
- Molecular and Cellular Endocrinology
- Publisher
- Elsevier BV
- Published
- 2011-01-01
- Volume
- 331
- Issue
- 1
- Pages
- 158-167
- ISSN
- 0303-7207 (ISSN-L)
- OpenAlex
- W2099128770
- Cited by
- 69
- References
- 56
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 5 · 2023: 4 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 5 · 2018: 4 · 2017: 6 · 2016: 6 · 2015: 2 · 2014: 9 · 2013: 5 · 2012: 5
- FWCI
- 4.84
- Type
- journal article
- Language
- en
- Open access
- green
- hal.science
- Licence
- Locations
- Molecular and Cellular Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- Trinity's Access to Research Output (TARA) (Trinity College Dublin) (submittedVersion)
- Topics
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glutathione Transferases and Polymorphisms
- Keywords
- endometrial cancer, estrogen metabolism, phase I enzymes, phase II enzymes, CYP1B1, CYP3A7, catechol-O-methyltransferase, membrane-bound COMT, SULT2B1, UGT2B7, GSTP1, CYP1A1, CYP1A2, CYP3A5, SULT1A1, SULT1E1, gene expression
- MeSH terms
- Adult, Aged, Aged, 80 and over, Aryl Hydrocarbon Hydroxylases, Catechol O-Methyltransferase, Endometrium, Estradiol, Estrogens, Female, Humans, Hydroxylation, Isoenzymes, Middle Aged, Glucuronosyltransferase, Sulfotransferases, Down-Regulation, Gene Expression Regulation, Enzymologic, Gene Expression Regulation, Neoplastic, Endometrial Neoplasms, Metabolic Detoxication, Phase I, Metabolic Detoxication, Phase II, Glutathione S-Transferase pi, Cytochrome P-450 CYP1B1
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